Java tutorial
import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<Integer> al = new ArrayList<Integer>(); al.add(new Integer(1)); al.add(new Integer(2)); al.add(new Integer(3)); al.add(new Integer(4)); al.add(new Integer(5)); System.out.println("contents of al : " + al); Object ia[] = al.toArray(); // get array int sum = 0; for (int i = 0; i < ia.length; i++) { sum += ((Integer) ia[i]).intValue(); } System.out.println("Sum is :" + sum); } }